Electric dry shaver



H. LANDSEEDEL ELECTRIC DRY SHAVER Feb. 18, 1941 Filed Dec. 29, 1957 FIG.3

Patented Feb. 18, 1941 UNITED STATES PATENT OFFICE ELECTRIC DRY SHAVER Application December 29, 1937, Serial No. 182,218

10 Claims.

This invention relates to improvements on electric dry shavers that are well known and particularly to means for varying the degree of oscillation of the inner cutters thereof.

It is a well known fact in the dry shaver art that slots in cutters provide means for the reception of hair and that the wider the hair slot the greater is the facility for reception of hair. Likewise, it is conceded that, with a greater re ception of hair, faster and closer shaving is effected. On the other hand, beards differ as does also the-texture of the skin so that it is accordingly necessary to provide varying widths in the hair slots of cutters adaptable to any condition of beard or skin.

The general purpose of this invention is to provide an adjustment on dry shavers to regulate the length of oscillation of the inner cutter so that resultant opening between the blades of the inner and outer cutters may be varied for the reception of hair.

One of the objects of this invention is to provide means for adapting cutters to any condition of beard or skin to effect a close and rapid shave.

A further object of this invention is to provide an oscillating lever having a yielding point to reduce the shock that may develop from a limited oscillation.

Further objects will be made apparent from a more detailed and complete description as hereinafter contained.

This invention resides in the combination, construction, arrangement and relative locations of parts, all of which will be described more fully and in detail in the ensuing specification, in connection with the drawing attached thereto, in which: I

Fig. l is an enlarged elevational view of the device herein claimed as my invention with parts broken away;

Fig. 2 is a view thereof taken substantially along line 22 of Fig. 1;

Fig. 3 is a view thereof taken substantially along line 33 of Fig. 1;

Fig. 4 is an enlarged end elevational view of the knurled thumb screw covered by this invention.

Like references of characters refer to like parts in the drawing.

The upper shearing portion of a dry shaver well known in the art is shown in all the figures in the drawing herein described. Only so much of the driving mechanism is disclosed as is necessary to describe the invention claimed.

In the drawing, a casing I is shown and within said casing is a well known motor not described except as aforementioned. Secured to casing in is a shearing head II which comprises an outer cutter l2 and an inner cutter l3. Place- 5 ment lug I4 on casing engages groove IS on the base of outer cutter. 12 (Fig. 1).

Within casing I0 is a rock lever l6 (Fig. 1) having a pivot pin I l, only part of which is shown herein. In nearly all respects, except as 10 hereinafter disclosed, rock lever It follows the form and construction of the rock lever referred to in my copending application for patent bearing Serial No. 123,162, filed January 30, 1937. y The only novel feature disclosed and claimed herein in connection with rock lever 16 is the construction of section I8 thereof immediately between the hub, positioned on pivot pin l1 and the extreme upper part l9. Section I8 of rock lever I6 is considerably reduced in size over that 20 in a corresponding section of any well known rock lever. This structure provides a definite degree of resiliency to the upper portion of rock lever 16. Also, within casing I0 is shown one of a pair of resilient plungers 2 13. Both rock levers I6 and resilient plungers 20 extend through openings in casing l0 (Fig. l) and openings in the base of outer cutter 12.

Inner cutter l3 has, formed on its base, groove 2| and notches 22, which respectively engage rock lever 16 and resilient plungers 20. On one end of inner cutter I 3 and adjacent one of the notches 22 is a deeper notch 23.

A knurled thumb screw 24, having a conical flange 25, extends transversely through a tapped opening 26 located in the base of the outer cutter on the medial line thereof. Formed above the thumb screw and also on the medial line is a longitudinal bore 21, in which is loosely held a small pin 28, having a fiat base 29 and an upper tapered head 30. The head 39 of pin 28 engages notch 23 of inner cutter l3 and base 29 thereof rests on thumb screw 24. Thumb screw 24 has formed, by grinding on its threaded portion 3|, three flat surfaces 32, 33, and 34. Surface 32 is ground deeper than surface 33, and surface 33 deeper than surface 34.

Knurled thumb screw 24 may be adjusted at different points of graduation. The end of the base plate of the outer cutter I2 is marked with the four graduations 35, 36, 31, and 38, and indicator line 39 is marked on the conical flange 25 of said thumb screw 24.

In operation, when knurled thumb screw 24 is adjusted to the extreme left so that indicator line 39 thereof is in alignment with the last graduation 35, the base of pin 28 follows the surface 32 (Fig. 1), thereby lowering the conical head to increase the clearance between it and the notch 23. Under these conditions the inner cutter I3 is free to oscillate to its maximum thereby permitting a maximum opening of the hair slots. When thumb screw 24 is turned to the right so that the indicator 39 is in alignment with graduation 36, pin 28 is raised by contact with the surface 33, thereby decreasing the clearance between its head 30 and the notch 23. The inner cutter I3 is now limited in its oscillation, thereby decreasing the width of the hair slots formed by the outer cutter l2 and the inner cutter. When thumb screw 24 is again turned to the right, until graduation!!! and indioator 39 are in alignment, pin 23 is raised higher into notch 23 by fiat surface 34. This further limits the oscillation of inner cutter I3 so that the width of the hair slots is again reduced.

. With the thumb screw 24 positioned, so that graduation 38 and indicator line 39 are in alignment, pin 28 rests on the threads of screw 24 and is raised to its limit in notch 23, thereby limiting the inner cutter l3 to its minimum oscillation. The yielding feature of rock lever It serves to break the strain of the shock received thereby when the oscillation thereof is limited by the'various adjustments of pin 28.

By these various adjustments, a wider or narrower hair slot may be obtained. adaptable to the requirements of a heavy or light beard as the case maybe. The wider the hair slot, the greater the oscillatory movement of the inner cutter, resulting in a more rapid shearing action of the cutters. Hence, the advantage is two-fold: to regulate the width of the slots for reception of hair, and to regulate the oscillating speed of the inner cutter.

While I have described what I consider to be a highly desirable embodiment of my invention, it is obvious that many changes in form could be made without departing from the spirit of my invention, and I, therefore, do not limit myself to the exact form herein shown and described, nor to anything less than the whole of my invention as hereinbefore set forth, and as hereinafter claimed.

What I claim as new, and desire to secure by Letters Patent, is:

1. A dry shaver of the' type described having a shearing head comprising an outer cutter and an inner oscillating cutter, a pin engaging said inner cutter, and threaded means within said outer cutter cooperating with said pin for regulating the amplitude of the oscillation of said inner cutter.

2. A dry shaver of the type described having a shearing head comprising an outer cutter having hair slots formed therein, an inner reciprocating cutter having corresponding slots formed therein, a pin engaging said inner cutter, and threaded means within said outer cutter cooperating with said pin for regulating the amplitude of the oscillation of said inner cutter whereby the extent of opening between said slots as defined by the relative movement of said cutters is reduced.

3. A dry shaver of the type described having an inner cutter and an outer cutter, said inner cutter being oscillated with respect to said outer cutter, a pin engaging said inner cutter, a threaded means within said outer cutter having cam faces cooperating with said pin for variably limiting the extent of oscillation of said inner cutter, and a driving means for said inner cutter having a point of resiliency formed therein adapted to absorb the shock of said limiting means.

4. A dry shaver of the type described having an inner and outer cutter, said inner cutter being adapted to be oscillated with respect to said outer cutter, a resilient driving means for said inner cutter comprising an oscillating lever having a reduced shank portion said outer cutter adapted to absorb shock, and a cooperating screw and pin means within said outer cutter for adjustably limiting the extent of oscillation of said inner cutter.

5. A dry shaving implement of the type described, a shearing head comprising an outer and of said inner cutter, and means for oscillating said inner cutter.

6. A dry shaving implement of the type described, a shearing head comprising an outer and inner cutter, a thumb screw in the base of said outer cutter, said screw having surfaces formed in the shank thereof, said surfaces forming graduated levels at various radii of said screw, a pin freely mounted in the base of said outer cutter, the head of said pin extending into a notch in the base of said inner cutter to limit the transverse movement thereof and the base of said pin engaging said screw, said screw being adapted to be adjusted to a plurality of positions whereby said pin limits the extent of oscillation of said inner cutter, and means for oscillating said inner cutter.

7. A dry shaving implement of the type described, a shearing head comprising an outer and inner cutter, a thumb screw positioned in said outer cutter having three flat surfaces ground in the threads thereof, said surfaces forming graduated levels at various radii of said screw, a pin having a conical head freely mounted in the base of said outer cutter at right angles to said screw, the conical head of said pin extending into a notch in the base of said inner cutter to limit the transverse movement thereof and the base of said pin engaging one of said surfaces on said screw, a plurality of graduations on said outer cutter to which said screw is adapted to be adjusted thereby positioning said pin to limit the extent of oscillation of said inner cutter and means for oscillating said inner cutter.

8. A dry shaving implement of the type described, a shearing head comprising an outer and inner cutter, a thumb screw positioned in said outer cutter, said screw having flat surfaces formed in the shank thereof, said surfaces forming graduated levels at various radii of said screw, a pin having a conical head freely mounted in the base of said outer cutter, the conical head of said pin extending into a notch in the base of said inner cutter to limit the transverse movement thereof and the base of said pin engaging the shank of said screw, a plurality of graduations on said outer cutter to which said screw is adapted to be adjusted thereby positioning said pin to limit the extent of oscillation of said inner cutter,

and driving means for oscillating said inner cutter.

9. A dry shaving implement of the type described, a shearing head comprising an outer and inner cutter, a knurled thumb screw located in the base on the center line of said outer cutter, said screw having three flat surfaces ground in the threads thereof, said surfaces forming graduated levels at various radii of said screw, a pin having a conical head freely mounted in the base of said outer cutter at right angles to said screw, the conical head of said pin extending into a notch in the base of said inner cutter to limit the transverse movement thereof and the base of said pin resting on one of said surfaces on said screw, a plurality of graduations on said outer cutter to which said screw is adapted to be adjusted thereby positioning said pin to limit the extent of oscillation of said inner cutter, and resilient driving,

means for oscillating said inner cutter.

10. A dry shaving implement of the type described including a motor casing, a shearing head secured to said motor casing, said head comprising an outer and inner cutter, a resilient driving arm for oscillating said inner cutter, a knurled thumb screw located in the base on the center line of said outer cutter, said screw having three flat surfaces ground in the threads thereof, said surfaces forming graduated levels at various radii of said screw, a pin having a conical head freely mounted in the base of said outer cutter at right angles to said screw, the conical head of said pin extending into a notch in the base of said inner cutter to limit the transverse movement thereof and the base of said pin being adapted to engage one of said surfaces on said screw and a plurality of graduations on said outer cutter to which said screw is adapted to be adjusted thereby positioning said pin to limit the extent of oscillation of said inner cutter, the shock of said limited movement being taken up by said resilient driving arm.

HARRY LANDSIEDEL. 

